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mrsbmarie mrsbmarie
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5 years ago
During intense physical exercise, human cells and tissues increase their need for oxygen to provide the ATP necessary for work. Why does heart rate have to increase to meet the need for oxygen?
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Mhartman97Mhartman97
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5 years ago
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This verified answer contains over 100 words.
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mrsbmarie Author
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5 years ago
Smart ... Thanks!
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Yesterday
You make an excellent tutor!
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2 hours ago
This site is awesome
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